Dividend-divisor aligning mechanism



May 24, 1960 w. K. a. KIEL ETAL 2,937,809

DIVIDEND-DIVISOR ALIGNING MECHANISM Filed June 27, 1955 2 Sheets-Sheet 1 @000000000077 @000000000000@ewemeavfI EN ditmaal :IDD -f IBCIDDDCJECIDD da mnmmnnmncnm 95 g '12 mmmmcmmmmmbl 7, y" mmclclmnnmmn @gjm EIDCIDDDEJDEJ @r 0 E00000003 '8 @0f/O 7 55' May 24, 1960 w. K. B. KIEL mL 2,937,809

DIVIDEND-DIVISOR ALIGN ING MECHANISM Filed June 27. 1955 2 Sheets-Sheet 2 Fig-3 INVENTORS: Muet/7d a /ef/ By Z//f/'c Tg5/f Jc. Qui

DIVIDEND-DIVISOR ALIGNING MECHANSM Wilhelm K. B. Kiel, Number-g, and Ulrich J. R. Eichler,

Numberg-Ebensee, Germany, assignors to Metall-Gussund Presswerk Heinrich Diehl Gesellschaft mit beschrnkter Haftung, Nurnberg, Germany Filed June 27, 1955, Ser. No. 518,252 l Claims priority, application Germany June 26, 1954 Y 7 Claims. (Cl. 23S- 63) The present invention relates to calculating machines and, more particularly, to a motor driven four-species calculating machine having a shiftable accumulator carriage, carriage shifting mechanism, and an automatic division control mechanism.

' It is an object of this invention to provide a dividenddivisor aligning mechanism for a calculating machine of the above noted type and, more particularly, to provide such -a mechanism which responds to the concurrent depressionV of a division key and an alignment key to condition the division mechanism for operation and institutel a multi-denominational shift of the carriage which is terminated in a selected denominational position by enabling the conditioned division mechanism upon release of the alignment key.

A further object of the invention is the provision of an alignment mechanism which releases and holds the operation of a division control mechanism in abeyance while a multidenominational shift of the carriage, concurrently initiated, takes place; the shift being terminated in a selected4 position by selectively enabling the released division mechanism.

It is also an object of this invention to provide a calculating machine of the above mentioned type which is relatively simple in construction and reliable in operation.

These and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawings, in which:

Fig. 1 illustrates a top view of a calculating machine withV the new aligning mechanism of the" present invention.

Fig'. 2 represents a modified portion of the control device on the right-hand frame wall.

Fig. 3 illustrates an isometric view of the principal construction of the calculating machine according to the present invention with all important parts necessary for the understanding of the invention, the various parts being pulled apart for the sake of clarity. The division structure shown in this gure is fully disclosed in applicants copending patent application Ser. No. 298,806, tiled July 14, 1952.

Fig. 4 is an isometric view of a safety device of the function control members.

General arrangement An aligning mechanism such as the one underlying the present invention, is necessary when carrying out automatic division, in which prior to the division process, the dividend and the divisor must* be placed in proper alignment..

The steps have heretofore in most instances been carried out separately, the carriage containing the dividend register being rstdisplaced by actuating the shift keys, andv the division operation being thereafter initiated by depression of the division key. With calculating machines having a shiftable'pincarriage for the divisor, in reversemanner, rst the diviser had to be moved be- United States Patent O 2,937,809 .Patented May 24, 196`0 4;.: low, i.e. aligned with the dividend. Alignment in this manner requires two control operations which are initiated independently of each other and require particularly careful attention onl the part of the operator.

In order to dispense with the independent actuation of a shift key7 and to eliminate faulty operations in connection therewith, it has heretofore been suggested to employ devices which are controlled by feelers or the like and automatically align the dividend and divisor when the division is initiated. However, the devices required for -such an arrangement are rather complex and thus considerably increase the cost of the machine.

According to the present invention manually operable control means are provided which, when actuated, initiate the shifting movement of a displaceable carriage, whereas, when said manually operable control means are released, the shifting movement is interrupted and the division process is initiated. In this arrangement, the division mechanism is released by the first operation of the control means and is restrained until the control means have been released.

The aligning mechanism according to the present invention in connection with a calculating machine equipped with a device for carrying out an automatic division will, by actuation of the manually operable control means, preset the division control device for operation and initiate a shifting operation for shifting of accumulator carriage containing the dividend relative to the divisor which is maintained until the carriage has reached its intended position and the control means are lreleased whereby the preset division control mechanism becomes eliective and interrupts the shifting movement. Thereupon, the dividing process will be carried out by the known method of addition and subtraction in alternate denominational orders.

Structural arrangement Referring now to the drawings in detail, the calculating machine shown therein comprises a stationary frame portion 1 housing the setting mechanism. This setting mechanism is composed of a plurality of key banks, for instance ten identical key banks 2 each of which comprises keys with the numeral values l to 9. In addition thereto, each key bank has associated therewith its own initiator key 3 Iwhich represents the value 0. The respective setting of the keys will be visible in the indicating device 4. The right-hand portion of the machine shows the functional keys spacially united. The numerals 5 and 6 designate the control keys for leftward and rightward carriage shift, whereas the numeral 7 indicates the subtraction key, and the numeral 8 indicates the addition key. The clearing keys are designated with the numerals 9, 10 and 11. Key 12 serves for controlling the return of the carriage 15 which is displaceable on the machine frame portion 1. The carriage' 15 houses the dividend accumulator 16 and the quotient or revolutions counter 17.

For purposes of initiating an automatic division, the stationary frame is provided with a key 13 arranged adjacent a key 14 for changing the direction of rotation of the revolutions counter 17 during a division. The pressure key 95 arranged adjacent the division key 13 serves for controlling the aligning mechanism the function of which will be explained further below.

The principal construction of the calculating machine in connection with which the present invention is to be explained, will be visible from Fig. 3 and has been fully disclosed in applicants above mentioned copending application Ser. No. 298,806. Therefore, only such struetural elements will here be described which are essen- 0 tially related to the present invention. These structural elements are primarily the control devices for leftward and rightward shift of the carriage and for addition and subtraction including the illustrated division automatics and those parts of the drive which cooperate with said division control automatics.

Drive The calculating machine is driven by an electric motor, not shown in Fig. 3, which motor by means of a stepdown transmission moves the shaft 18 in clockwise direction with regard to Fig. 3. Mounted on this shaft 18 is a ratchet wheel 19 which forms a part of a onerevolution clutch 20. The construction and operation of a clutch of this type is known and, therefore, will not be described any further.

The arrangement furthermore comprises a shaft 2.1 driven in counter-clockwise direction through hte inter vention of a similar one-revolution clutch. This clutch 21 for driving the differential actuator has been illu..- trated in part only. By means of a bevel gear transmission 22, 23, the said shaft 21 drives a shaft 24 of square cr'oss section. Displaceably mounted on shaft 24 is an impulse cam 25. The impulse for displacement starts from the last decimal shift linger when in the accumulator a decimal transfer occurs all the way through. Due to the said displacement, the cam disc 25 moves into the range of the pin 26, and when the calculating shaft 21 rotates, is able to push the pin 26 downwardly. As a result thereof, the lever 27 moves the shifter 28 in clockwise direction, which shifter is tiltably journalled on a control shaft 29. Fig. 3 shows the shifter 28 in its clockwise rest position in which the control arm 30 pivotally connected to arm 31 of the shifter is held in rightmost position by means of a pawl 72 which is held in engagement with arm 30 by means of a spring 94. The shifter 28 is released when the divide key 13 is depressed and the arm 85 of the key stem 76 releases the pawl 72 from engagement with arm 30. As a result thereof, the control arm 30 can, due to the tension of spring 32, rotate counterclockwise to effective operating position. Furthermore, the arm 30 tilts the shifter 28 likewise in counterclockwise direction and does so through the intervention of the arm 31 to which the arm 30 is pivotally connected. The cooperation of the division control levers will be described in connection with the operation of the device.

Whenever manually or automatically a carriage shift is initiated, the above mentioned shift control shaft 29 is rotated in clockwise direction. Mounted on said shaft 29 is a clutch release lever 33 which releases the clutch 20 for one or a plurality of complete rotations and makes the motor drive effective. A bevel gear transmission 34, 35, 36 is operated from the output side of said clutch 20. The bevel gear 35 of 4said bevel gear transmission brings about a carriage shift through the intervention of a gear 37. The bevel gear 36 is mounted on a hollow shaft 38 which drives the eccentric disc 39 and, through the intervention of the eccentric rod 4t) and lever 41, oscillates the hollow shaft 42 once per'each rotation of the shift clutch 20.

Control mechanism The operation of the machine is effected by means of the function keys and the control mechanism associated therewith and located below said keys as shown in applicants co-pending application Ser. No. 298,806. Said control mechanism comprises the various power members operable in response to the actuation of keys. For the sake of clarity, the keys 9 to 12 and the key 14 as well as the control linkage for the said keys have been omitted inasmuch as they are not essential for the understanding of the present invention. The said control mechanism. may be actuated manually by means of the keys to 8. The keys have associated therewith two-arm levers 43 to 46 which are tiltably mounted on a shaft 47 common thereto. Springs (spring 48 only being shown) are respectively connected to said actuating levers 43 to 46 which are each provided with a nose 4'9. The said springs cause the noses 49 of the levers 43 to 46 to catch behind the respective adjacent nose of control members 50 to 53 respectively. The four control members 50 to 53 have associated therewith springs 54 (one only, namely that associated with the control member 53 being shown). These springs 54 continuously tend to tilt the control members 50 to 53 in clockwise direction about the shaft 55 common to said control members. Each control member together with the respective storage spring 54 forms a working unit which henceforth will be called the power control unit. Linked to the control members 50 to 53 are the lever means which prepare and make effective the respective machine operations when the respective power unit is released, and also switch on the motor. While the respective operation is still being carried out, either due to the above mentioned eccentric stroke of arm `40 or by turning shaft 56 by means of main calculating shaft 21 as disclosed in the above mentioned application Ser. No. 398,806, the respective spring of the respectively actuated control members 50 to 53 is again tensioned when the respective control member returns to its starting position. For Aagain tensioning the storage springs 54, the lower ends of the control members 50 to 53 are respectively provided with studs 57 to 60 against which cams 61 to 64 press when the shaft 42 or shaft 56 is rotated. The cams 61 and 62 move the control members 50 and 51 which control carriage shifting and, as mentioned above the cams are oscillated when the yshifting clutch rotates. The cams 63 and 64 return the control mambers 52 and 53 which control addition and subtraction and are in their turn oscillated by the drive shaft 21 for the differential actuator.

Division control Whereas the manual operation of the control mechanism has been described above, the automatic control of said control mechanism will now be described as is necessary when automatically carrying out a division. To this end, the construction shown in Fig. 3 is provided with a control shaft 65. The left-hand end of control shaft 65 has mounted thereon a control disc 66 with four control pins spaced from each other by an angle of 90. This control disc 66 serves for incrementally advancing the division control shaft 65 which extends below angular-shaped extensions of the actuating levers 43 to 46. Small control pins 67 to 70 are carried by the control shaft 65 and located below the extensions of the actuating levers 43, 45 and 46. The pins 67 and 68 are offset with regard to each other by 180 and are associated with the lever 43 for controlling the left-hand carriage shift. The control pin 69 is associated with the actuating lever 45 for controlling subtraction, whereas the control pin 70 is associated with the actuating lever 46 for controlling addition. It will be evident from Fig. 3 how the actuating levers 45, 43, 46, 43 are successively lifted or tilted in clockwise direction upon each revolution of shaft 65 and control disc 66. That end of the control shaft 65 which extends through the righthand frame wall 107 is provided with a semi-circular plate 79 equipped with a pin 78. When the plate 79 occupies its normal full-cycle position, an arm 77 extends along the cord of the plate 79, said arm 77 being connected to the key stem 76 of the division function control key 13. The arm 77 has tiltably connected thereto a small lever 80 which by means of a tension spring 81 is continuously urged to abut the pin 78. The spring 81 has one end connected to an ear at the outer end of the arm 77 and has its other end hooked into an ear in the lever 80. In the normal position of the parts, lever 80 overlies an upturned arm 87 of a pivoted bail 88 which controls the right shift lever 44. Key stem 76 of division key 13 also has a laterally extending Iarm 85 which overlies an arm 93 of pivoted latch 72 urged clockwise by spring 94 to engage nose 73 of arm 30. Upon depression of the key, the latch is rocked counter clockwise to release arm 30 urged rearwardly by spring 32. Spring 32 also urges shifter yoke 28 counter clockwise to a position wherein the shifter yoke 28 may be tilted in clockwise direction either by the pin 74 of clutch 20 after each shift cycle or by cam 25 as the result of an overdraft. With each rotation, pin 74 rocks the arm '75 which is connected to the shifter yoke 28. As a result of the said tilting Ymovement of the shifter yoke 28, the arm 30 is pushed toward the right through the intervention of the arm 31, and by means of its nose 71 pushes ahead or advances that one of the four shifting pins in plate 66 which at that time is engaged by said nose 71, thereby rotating the control shaft 65 further by 90.

In order to maintain the division up to the last digit, there is' provided a slide `83 (see Fig. 3). This slide 83 is, in a manner known per se, controlled by the carriage and is provided with a hook 84 adapted to engage a corresponding counter hook on arm 85 of the division key stem 76 when the key 13 is depressed. In this Way, the key 13 is held in its depressed position until the slide 8'3 is moved toward the right against the tension of spring 82 either by the carriage returning to its basic position or manually when the division is deliberately prematurely interrupted.

Division release mechanism In the division mechanism disclosed in application Serial No. 298,806 previously mentioned, the initial .rotation of control shaft 65 is effected manually whereby the division function control key is somewhat hard to operate. ln order to overcome this drawback, means for actuating the division control shaft by the motor driven elements will now be briey described.`

The lever 80 previously described is tiltably supported by the, arm 77 of the stem 76 of the division function control key 13. Lever 80 is held in its illustrated position bythe spring 81 and has its lower end provided with a lateral pin 86 resting upon a bar 87. The bar 87 in its turn is rigidly connected to a shifter yoke 88 which is tiltably supported by the division control shaft 65. Within the range of the power control unit 51 for right-hand shift, the shifter yoke A88 has an arm 89 which extends up to the angular extension of the control lever 44. The arm 89 carries a lateral pin 90 which lifts the actuating lever 44 when the shifter yoke 88 is tilted in clockwise direction. Also connected to arm 89 is one end of la spring 91 the other end of' which is anchored to a stationary point. This spring continuously tends to hold the arm 89 in its ineffective position or to return said arm to said position.

Advance control As Vwill be evident from Fig. 3, when the division function control key 13 is depressed, the arm 85 of the key stern 76 actuates Vthe arm 93 and lifts the pawl 72 out of the nose 73 of the control arm 30. Simultaneously with the depression of the division function control key 13, key 95 is depressed so that a lateral pin 97 on its key stem 96 moves a latch member 98 into the path of the control arm A30 with the result that the arm 30 cannot move into its effective operating position. Por purposes of clearly showing the operation of the key 95, the latter vis lshown in depressed position in Fig. 3. The latch 98 is tiltably supported by the machine and, when vthe key 95 is not depressed, is pulled upwardly by a spring 99 'to such an extent that the nose 100 of the latch 98 is withdrawn from the path of movement of the arm 30. Rotation of the division control shaft 65 is, therefore, as evident from Fig. 3, prevented as long as the key 95 is maintained in depressed position, i.e.'as long as-the operator has his finger on the depressed V6 key 95. The division mechanism is thus conditioned for operation but held in abeyance until key 95 is released.

Operation The cooperation of the various control means will now be described with regard to Fig. 3. It may be assumed that the movable carriage contains a dividend with a plurality of digits and that the setting mechanism comprises a relatively small divisor. How the dividend and the divisor are brought into the carriage and into the setting mechanism will not be described inasmuch as it is not necessary for the understanding of the invention. Whereas with the heretofore known machines, the operator first depresses the carriage shift control key until the dividend and divisor are aligned with each other, with the device according to the present invention, the operator iirst depresses the key group 13, 14, 95. As a result thereof, lever which is tiltably journalled on `arm 77 of key 76 presses upon the bar 87 by means of its pin 86 and thus brings into action the right-hand shift actuating lever 44 so that operation of the carriage shift mechanism to shift the carriage to the right is initiated. When stem 76 of the division function control key -13 is moved downwardly, its arm also tilts the bar 93,

so that the arm 30 is released by pawl 72 and urged byl spring 32 to effective operating position. However, when the key group was depressed, also the key stem 96 was moved downwardly into its position shown in Fig. 3 so that its pin 97 tilts the latch 98 downwardly against the thrust of a spring 99 to such an extent that the nose 100 of the latch 98 occupies a position in front of the rearward end of arm 30 thereby preventing the latter for the time being from moving into its effective position. When the first right-hand shift step has been completed, the eccentric 39 actuated by the shift coupling output gear train, shifts the control member 51 into its initial cocked position through cam 63 connected to the hollow shaft 42. However, the control member 51 is not latched since the actuating lever 44 is still in its lifted position so that the control member 51 immediately initiates the next right-hand shift step. In this way the carriage 15 shifts from position Ito position. When the operator now observes that the dividend and the divisor are in theirproper position with regard to each other, he releases the key group. As a result thereof, the key stern 96 is immediately returned to its initial undepressed position by means of the thrust of spring 99 connected to the latch 98. The key stem 96 remains preferably locked in depressed position, as will be explained later, for the duration of the dividing operation. When the latching nose 100 tilts upwardly, it also definitely releases the control arm 30 which therefore moves into its operating position and moves the shifting yoke 28 with arm 75 into the range of movement of the pin 74 of the shift clutch. Inasmuch as the shift mechanism is operating, the pin 74 immediately pushes against the arm 75 thereby tilting the shifter yoke 28 in clockwise direction. This movement is conveyed to the control arm 30 :through arm 31, and the arm 30 rotates the control shaft 65 by its nose 71 engaging one of the shifter pins on plate 66. This first incremental rotation of the control shaft 65 causes the pin 78 in plate 79 to rotate lever 80 in a clockwise direction with regard to Fig. 3. As a result thereof, the pin 86 slides off the bar 87 and, due to the thrust of the spring 81, the bar 87 immediately returns to its initial upper position so that the pin 86 after release of the lever 80 can rest laterally against bar 87 without further effect. With this first rotation of the division control shaft 65, the division has started and continues in a manner known per se until latch slide 83 is released and spring 114 pulls stem 76 of the division `function control key 13 upwardly.

'In order to prevent any interference with the dividing operation, a safety device is provided which prevents the key stem 96 from being depressed as long as the dividing operation has not been completed. Such a safety device is shown in Fig. 4. As will be seen from Fig. 4, instead of arranging the two keys 13 and 95 close to each other as shown in Figs. 1 and 3, the two keys may also be coupled to each other as shown in Fig. 4. According to Fig. 4, a key 105 attached to key stem 96 extends over the key vstem 76. As will be evident from Fig. 4, no fixed connection is established between the key 105 and the key stem 76. Consequently, after the key stem 76 has been depressed, it can remain in its downward position until the division has been completed. In order to avoid locking the shifting yoke 28 by an unintentional depression of the key 105, the above mentioned safety device is provided which will prevent a depression of the key 105 as long as the key stem 76 has not been released. The principal features of this safety device are shown in Fig. 4 which in contrast to Fig. 3 shows the device with the parts in relative positions occupied during a division operation. The key 105 and the attached key stem 96 have already returned to their initial raised position while the division key stem 76 is still in operative depressed position. As will be clear from Fig. 4, the key stem 96 has a step 104. Below said step 104 a pin 101 rests against the stem 96. The pin 101 is supported by a small lever 102 which is pivotally supported by the division key stem 76 and is under continuous influence of a spring 103 which tends to cause the pin 101 to abut the key stems 96 and 76. A fixed guiding cam 106 is provided between the two key stems 76 and 96. This guiding cam is provided with a cam section which becomes gradually wider in an upward direction so that when the key stem 76 moves upwardly, the pin 101 slides along said cam. If, as shown in Fig. 4, the key stem 76 occupies its depressed position, the key S can be depressed only to such an extent that step 104 abuts pin 101. This stroke is so small that `the nose 100 (Fig. 3) will not come within the range of the control arm 30 so that the dividing operation cannot be interfered with. If the above safety device were missing, it would be possible to stop the division operation by depressing Ithe key 95, because the nose 100 could again engage the end of the arm 30 during the next operating stroke thereof. The device shown in Fig. 4 avoids such interference by rigidly connecting the key 105 with the key stem 96 only whereas the division key stem 76 can be moved downwardly only and can return to its starting position only after completion of the division.

When the key 10S is depressed, simultaneously the division key stem 76 and the key stem 96 move downwardly, and the carriage shifting operation is effected in the manner described. When the carriage reaches its intended position, the key 105 is released and returns upwardly, whereas the division key stem 76 remains in its downward position. Thus, the pin 101 on lever 102 occupies a position below the extension 104 of the key stem 96. When the key 105 moved upwardly, the pin 101 was able to slide off from the wide portion of the key stem 96 because the guiding cam 106 is narrow in the position occupied by the pin 101 with the key stern 76 in depressed position. If now an attempt were made to depress the key 105, the extension 104` would engage the pin 101. lf, however, the division has been completed so that the key stem 76 has been released and can be moved upwardly by spring 114, the pin 101 on lever 102 will be guided off laterally by the guiding cam 106 so that it can again engage the key stern 96 above the extension 104 thereby again unlocking the key 105. The above control device according to the invention for automatically shifting the dividend carriage prior to the starting of the division considerably facilitates the operators work in handling the calculating machine. This improvement is obtained almost without any additional parts so that the invention can also be applied to simpler four-species calculating machines.

It is, of course, understood that the present invention is, by no means, limited to the particular construction shown in the drawing but also comprises any modifications within the scope of the appended claims.

Thus, according to the modification shown in Fig. 2, illustrating the division initiating portion on the righthand sde of the frame outer wall 107 of the calculating machine, instead of the above mentioned arm 77, the key stem 76 is provided with a pin 108 adapted to slide in a slot 109 of a lever 110 which is rotatably journalled in the wall 107. When the division function control key 13 is depressed, pin 108 tilts the lever 110 in counterclockwise direction so that the short lever 80 is moved downwardly with the result that its pin 486 pushes against the arm 87 which extends through an opening 111 of the frame wall 107. On the right-hand side of the key stem 76 of the division function control key 13 there will also be seen the bar 9'3 of the pawl 72 which bar releases the step shifting mechanism 30, 71, 66, said bar 93 extending through an aperture 112 in the wall 107. The return of the division control key to normal undepressed position is brought about by a spring 114 one end of which is connected to a pin 113 carried by the wall 107 and serving simultaneously as guide for the key stem 76, while the other end of the spring 114 is connected to the pin 108 of the stem 76 of the division function control key 13.

What we claim is:

l. In a motor driven calculating machine, comprising a differential actuator, an ordinally shiftable register carriage having registering means therein and being transversely shiftable relative to said actuator, a mechanism for ordinally shifting said carriage, control means for initiating operation of said differential actuator and said shift mechanism respectively, spring-power operated control members movable from an ineffective to an effective position for respectively actuating said control means, locking lever means respectively associated with said control members for locking the same in their ineffective position, a normally disabled cyclically operable device controlled by said registering means and said shift mechanism for actuating said locking lever means in predetermined sequence, the combination of first key means movable from an ineffective into an effective position for enabling operation of said cyclically operable device, actuating means adapted to be moved to an effective position thereof to actuate a said lever means for initiating operation of said shift mechanism, normally effective coupling means connecting said key means with said actuating means and adapted to move said actuating means to effective position when said key means is moved to effective position, a manually depressible second key means, blocking means controlled by said second key means for maintaining said cyclically operable device disabled and thus delaying initiation of operation of said cyclically operable device while said second key means is held depressed, and releasing means controlled by said cyclically operable device for making said coupling means ineffective.

2. In a motor driven calculating machine, comprising a differential actuator, an ordinally shiftable register carriage having registering means therein and being transversely shiftable relative to said actuator, a mechanism for ordinally shifting said carriage, control means for initiating operation of said differential actuator and said shift mechanism respectively, spring-power operated control members movable from an ineffective to an effective position for respectively actuating said control means, first locking lever means respectively associated with said control members for locking the same in their ineffective'v position, a normally disabled sequentially operable device for actuating said locking lever means in predetermined sequence, operating means adapted to be moved from an ineffective to an effective position and controlled alternately by said registering means and said shift mechanism for actuating said sequentially operable device,

memos spring means for Vmoving said operating means to an effective position, second locking lever means for locking said operating means in ineffective position, the combination of: first key means movable to effective position for actuating said second locking lever vmeans to release said operating means, actuating means adapted to be moved to effective position to actuate a said first locking lever means for initiating operation of said shift mechanism, a normally effective coupling means connecting 'said key means with said actuating means and adapted to move said actuating means to effective position when said -key means is moved to effective position, a manually depressible second key means, normally ineffective blocking means controlled by said second key means for blocking said operating means in said ineffective position upon depression of said second key means, spring means urging said blocking means to ineffective position, releasing means controlled by said sequentially operable device to make said coupling means ineffective upon release of said second key means, and resetting means for restoring said actuating means from effective position after said coupling means has been made ineffective.

3. In a calculating machine comprising a differential actuator, an ordinally shiftable carriage transversely shiftable relative to said actuator, shifting means for ordinally shifting carriage, control mechanisms for selectivelyinitiating operation of said differential actuator and said shifting means respectively, a dividend register in said carriage, an overdraft mechanism, a normally disabled device adapted Vto be controlled alternately by said overdraft mechanism and said shifting means respectively for sequentially actuating said respective control mechanisms, the combination of: a first key movable from an ineffective to an effective position, first initiating means operable in response to movement of said first key to effective position to enable said device, second initiating means movable to effective position for actuating a said control mechanism to initiate operation of said shift mechanism, normally effective coupling means connecting said first key to said second initiating means to move said second initiating means to effective position when said first key is moved to effective position, a manually depressible second key, blocking means operatively connected to said second 4key movable from ineffective to effective position to maintain said device disabled upon depression of said second key, means connected to said second key and adapted to engage said first key for simultaneously moving said first key from ineffective into effective position, spring means associated with said second key and adapted to restore the latter from depressed position, and means operable by said device to make said coupling means ineffective upon release of said second key for terminating operation of said shifting means.

4. In a calculating machine comprising fa differential actuator, a value entering mechanism, an ordinally shiftable carriage transversely shiftable relative to said actuator and having a register therein operable by said actuator to receive a value from said entering mechanism, shifting means for ordinally shifting said carriage, and a division control mechanism operable to control sequential operation of said actuator yand said shifting means to divide a value in said register by a value in said entering mechanism, the combination of a depressible divide key, means responsive to depression of said divide key for initiating operation of said division control mechanism, lever means operable in response to depression of said divide key for initiating operation of said shifting means, a normally effective coupling means connecting said divide key to said lever means, a manually depressible dividend alignment key operable simultaneously with said divide key from an ineffective to an effective position, blocking means operatively connected with said alignment key and movable to effective position to prevent operation of said division mechanism upon depression of said alignment key, spring means engaging said blocking means and |adapted to be loaded in response to a depression of said dividend alignment key and upon release of said alignment key to restore said blocking `means toincffective position, and means responsive to operation of said division control mechanism to render said coupling means ineffective.

5. In a calculating machine comprising a differential actuator, a value entering mechanism, an ordinally shiftable carriage transversely shiftable relative to said actuator and having a register therein operable by said actuator to receive a value from said entering mechanism, shifting means for ordinally shifting said carriage, and a division control mechanism operable to control sequential operation of said actuator and said shifting means to divide a value in said register by a value in said entering mechanism, the combination of: a depressible divide key movable from an ineffective to an effective position, means responsive to the depression of said divide key for initiating operation of said division control mechanism, lever means operable to an effective position in response to depression of said divide key for initiating operation of said shifting means, a spring means to-restore said lever means to ineffective position, a normally effective coupling means connecting said divide key to said lever means and adapted to move said lever means to effective position when said divide key is moved to effective position, a manually depressible dividend alignment key operable simultaneously with said divide key, blocking means operatively connected with said alignment key and movable to effective position upon depression of said alignment key to prevent an operation of said division mechanism, spring means urging said blocking means to ineffective position, said spring means being loaded in response to a depression of said alignment key and moving said blocking means to its ineffective position upon release of said alignment key, means responsive to operation of said division control mechanism to render said coupling means ineffective thereby allowing said lever means to move into ineffective position, and means blocking redepression of said alignment key upon release of said alignment key with said divide key depressed.

6. In a calculating machine comprising a differential actuator, a value entering mechanism, an ordinally shiftable carriage transversely shiftable relative to said actuator and having a register therein operable by said actuator to receive a value from said entering mechanism, shifting means for ordinally shifting said carriage, and a division control mechanism operable to control sequential operation of said actuator and said shifting means to divide a value in said register by a value in said entering mechanism, the combination of: a divide key, means responsive to a depression of said divide key for initiating operation of said division control mechanism, lever means operable to an effective position in response to a depression of said divide key for initiating operation of said shifting means, spring means continuously urging said lever means to ineffective position, said lever means including normally effective coupling means connecting said divide key to said lever means to move said lever means to effective position when said divide key is depressed, a manually depressible dividend alignment key movable simultaneously with said divide key, blocking means operatively connected with said alignment key and movable to an effective position for preventing an operation of said division mechanism upon depression of said alignment key, spring means urging said blocking means to ineffective position upon release of said alignment key, said spring means being loaded in response to a depression of said alignment key and moving said blocking means to its ineffective position upon release of said alignment key, means operable by said division mechanism to render said coupling means ineffective thereby allowing said lever means to move to ineffective position, means controlled by said divide key for blocking redepression of said alignment key after release thereof with said divide key depressed, and means connected to said alignment key and extending above said divide key to depress the divide key by depressing said alignment key.

7. In a calculating machine comprising a differential actuator, a key board, an ordinally shiftable register carriage transversely shiftable relative to said actuator and having a register therein operable by said actuator to receive a value from said keyboard, shifting means for ordinally shifting said carriage, and a division control mechanism operable to control sequential operation of said actuator and said shifting means to divide a value in said register by a value in said keyboard, the combinat-ion of: a depressible divide key, means responsive to a depression of said divide key for initiating operation of said division control mechanism, lever means operable to eiective position in response to a depression of said divide key for initiating operation of said shifting means, spring means continuously urging said lever means to ineffective position, normally effective coupling means connecting said divide key to said lever means to move said lever means to effective position when said divide key is depressed, a manually depressible dividend alignment key operable simultaneously with said divide key, blocking means operatively Connected with said alignment key and movable to an effective position for preventing an operation of said division mechanism upon depression of said alignment key, spring means urging said blocking means to ineffective position upon release of said alignment key, said spring means being loaded in response to depression of said alignment key and to move said blocking means to its ineffective position upon release of said alignment key, means operable by said division mechanism to render said coupling means ineffective thereby allowing said lever means to move to ineiective position, means connected to said alignment key and extending above said divide key, said last mentioned means being adapted to depress said divide key upon depression of said alignment key and to disengage said divide key upon release of said alignment key, said alignment key being provided with a notch, latch means pivotally carried by said divide key and being continuously urged toward said alignment key for engaging said notch when said divide key is depressed and said alignment key is undepressed, and cam means for controlling said latch means so as to allow said latch means to engage said notch upon release of said alignment key with the divide key depressed and to disengage said notch upon release of said divide key.

References Cited in the file of this patent UNITED STATES PATENTS 2,404,170 Gubelmann July 16, 1946 2,636,677 Gang Apr. 28, 1953 2,710,141 Avery June 7, 1955 2,715,498 Tenoort Aug. 16, 1955 2,809,786 Hopkins Oct. 15, 1957 FOREIGN PATENTS 277.362 Switzerland Dec. 1. 1951 

